The point of (expensive) cloud storage is to offer a safe backup (that is, a copy) of your data. Certainly much cheaper than cloud storage. That said, something about the way you frame the question suggests to me that there is a different issue at play here. If you merely want to 'offload' data from your hard drive to the net, you should get a different service, as Dropbox is relatively expensive and not designed for this job. It is not designed to be an upload service. The whole point of Dropbox is to synchronise the data on your device(s) and on the cloud. While Sam's method should work, Jan's right.
